How to fix “ERROR: column c.relhasoids does not exist” in Postgres?

I am able to reproduce your error if I am using Postgres v.12 and an older client (v.11 or earlier):

[root@def /]# psql -h 172.17.0.3
psql (11.5, server 12.0)
WARNING: psql major version 11, server major version 12.
         Some psql features might not work.
Type "help" for help.

postgres=# create table mytable (id int, name text);
CREATE TABLE
postgres=# table mytable;
 id | name 
----+------
(0 rows)

postgres=# \d mytable;
ERROR:  column c.relhasoids does not exist
LINE 1: ...riggers, c.relrowsecurity, c.relforcerowsecurity, c.relhasoi...
                                                             ^
postgres=# 

This is because in v. 12, table OIDs are no longer treated as special columns, and hence the relhasoids column is no longer necessary. Please make sure you’re using a v. 12 psql binary so you don’t encounter this error.

You may not necessarily be using psql, so the more general answer here is to make sure you’re using a compatible client.